package org.apache.rocketmq.proxy.service.relay;

import org.apache.rocketmq.common.message.MessageConst;
import org.apache.rocketmq.common.message.MessageExt;
import org.apache.rocketmq.proxy.common.ProxyContext;
import org.apache.rocketmq.proxy.common.ProxyException;
import org.apache.rocketmq.proxy.common.ProxyExceptionCode;

import org.apache.rocketmq.proxy.common.utils.ProxyUtils;
import org.apache.rocketmq.proxy.service.transaction.TransactionData;
import org.apache.rocketmq.proxy.service.transaction.TransactionService;
import org.apache.rocketmq.remoting.protocol.RemotingCommand;
import org.apache.rocketmq.remoting.protocol.header.CheckTransactionStateRequestHeader;

import java.util.concurrent.CompletableFuture;


//这个类中的成员变量和方法在第十版本代码中用不到，所以暂时不添加注释，大家直接忽略即可
public abstract class AbstractProxyRelayService implements ProxyRelayService {

    protected final TransactionService transactionService;

    public AbstractProxyRelayService(TransactionService transactionService) {
        this.transactionService = transactionService;
    }


    @Override
    public RelayData<TransactionData, Void> processCheckTransactionState(ProxyContext context, RemotingCommand command, CheckTransactionStateRequestHeader header, MessageExt messageExt) {

        CompletableFuture<ProxyRelayResult<Void>> future = new CompletableFuture<>();
        String group = messageExt.getProperty(MessageConst.PROPERTY_PRODUCER_GROUP);
        TransactionData transactionData = transactionService.addTransactionDataByBrokerAddr(
                context,
                command.getExtFields().get(ProxyUtils.BROKER_ADDR),
                group,
                header.getTranStateTableOffset(),
                header.getCommitLogOffset(),
                header.getTransactionId(),
                messageExt);
        if (transactionData == null) {
            throw new ProxyException(ProxyExceptionCode.INTERNAL_SERVER_ERROR,
                    String.format("add transaction data failed. request:%s, message:%s", command, messageExt));
        }
        future.exceptionally(throwable -> {
            this.transactionService.onSendCheckTransactionStateFailed(context, group, transactionData);
            return null;
        });
        return new RelayData<>(transactionData, future);
    }
}
